EP2942202B1 - Wärmetransferbildempfangsfolie und bilderzeugungsverfahren - Google Patents

Wärmetransferbildempfangsfolie und bilderzeugungsverfahren Download PDF

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Publication number
EP2942202B1
EP2942202B1 EP14754013.2A EP14754013A EP2942202B1 EP 2942202 B1 EP2942202 B1 EP 2942202B1 EP 14754013 A EP14754013 A EP 14754013A EP 2942202 B1 EP2942202 B1 EP 2942202B1
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EP
European Patent Office
Prior art keywords
layer
porous
thermal transfer
sheet
image receiving
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EP14754013.2A
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English (en)
French (fr)
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EP2942202A4 (de
EP2942202A1 (de
Inventor
Koji Yamamuro
Masayuki Tani
Shinji Kometani
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Dai Nippon Printing Co Ltd
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Dai Nippon Printing Co Ltd
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
    • B41M5/42—Intermediate, backcoat, or covering layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
    • B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
    • B41J2/325—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads by selective transfer of ink from ink carrier, e.g. from ink ribbon or sheet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
    • B41M2205/02—Dye diffusion thermal transfer printing (D2T2)
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
    • B41M2205/32—Thermal receivers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
    • B41M2205/38—Intermediate layers; Layers between substrate and imaging layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
    • B41M5/42—Intermediate, backcoat, or covering layers
    • B41M5/44—Intermediate, backcoat, or covering layers characterised by the macromolecular compounds

Definitions

  • the present invention relates to a thermal transfer image receiving sheet and an image forming method for forming an image on the thermal transfer image receiving sheet.
  • thermal sublimation transfer method uses sublimation dyes as a color material and forms images by thermally-transferring the dyes in the dye layer of a thermal transfer sheet to the dye receiving layer of a thermal transfer image receiving sheet.
  • this method at the time of thermal transfer, many color dots in three or four colors are transferred to the dye receiving layer of the thermal transfer image receiving sheet by controlling the heating amount with the thermal head of a printer, and the multicolored dots are superimposed in sequence for gradation printing, thereby reproducing a full color image.
  • the thus-formed image is very sharp and excellent in transparency; therefore, excellent halftone reproducibility and compatibility can be obtained, and high-quality images that are comparable to full color photographs can be formed.
  • an image receiving sheet containing a composite sheet and image-receiving layer wherein the composite sheet is composed of a biaxially-stretched porous film layer, which has a porous structure, and a biaxially-stretched non-porous film layer, which is formed thereon and has a thickness of 0.5 to 5 ⁇ m and no pores, and the image receiving layer is disposed on the biaxially-stretched non-porous film layer of the composite sheet.
  • a dye receiving element for the purpose of providing a base for thermal dye-transfer receiver, which exhibits low curl, good uniformity and efficient thermal transfer capability, wherein the element contains an image receiving layer, a support and a composite film disposed therebetween, and wherein the composite film contains a microvoided thermoplastic core layer and substantially void-free thermoplastic surface layers disposed on both surfaces thereof.
  • the image receiving sheet is said to provide a clear image having high density, high gloss and reduced rough feeling even using reduced printing energy.
  • EP0551894 describes thermal dye transfer receiving elements comprising a base having thereon a dye image-receiving layer, the base comprising a composite film laminated to a support, the dye receiving layer being on the composite film side of the base.
  • the composite film comprises a microvoided thermoplastic core layer and at least one substantially void-free thermoplastic surface (skin) layer.
  • EP0778155 describes thermal transfer dye receiving elements comprising a base having thereon a dye image receiving layer, the base comprising a composite film laminated to a support, the dye image-receiving layer being on the composite film side of the base.
  • the composite film comprises a microvoided thermoplastic core layer and at least one substantially void free thermoplastic surface (skin) layer having a thickness of 3 to 6 ⁇ m, and the support comprising a latex-impregnated paper.
  • EP0671281 describes thermal dye transfer receiving elements comprising a base having thereon a dye image receiving layer, the base comprising a film laminated to a support, the dye image-receiving layer being on the composite film side of the base.
  • the composite film comprises a microvoided thermoplastic core layer and at least one substantially void-free thermoplastic surface (skin) layer having a thickness of about 3 to 6 ⁇ m, the surface layer containing at least about 0.5g/m 2 of TiO 2 .
  • US6020286 describes a dye-receiving element for thermal transfer having a substrate, a composite foil and a dye-receiving layer, the composite foil contains a thermoplastic core layer exhibiting micropores and on the side facing the receiving layer, at least two pore-free thermoplastic surface layers, the substrate being a paper with a density of ⁇ 0.8g/cm 3 .
  • An object of the present invention is to provide a thermal transfer image receiving sheet which is able to provide excellent printing sensitivity and prevent the generation of burns and folded lines, even during high speed printing.
  • Another object of the present invention is to provide an image forming method for forming an image on the thermal transfer image receiving sheet.
  • the thermal transfer image receiving sheet of the present invention is a thermal transfer image receiving sheet comprising a substrate and, on at least one surface of the substrate, a composite porous layer containing a thermoplastic resin as a main component in an amount of 50% by mass or more, and a dye receiving layer in this order from the substrate, wherein the composite porous layer comprises a porous core layer and non-porous skin layers having a porosity of 1% by volume or less layered on both surfaces of the porous core layer; a total thickness of the non-porous skin layers is 5 to 15% of a whole thickness of the composite porous layer; and the density of the composite porous layer is 0.65 to 0.74 g/cm 3 ; characterized in that, when the thickness of the non-porous skin layer on the dye-receiving layer side is set to "a" ⁇ m, and the thickness of the non-porous skin layer on the substrate side is set to "b" ⁇ m, "a"/"b" is 0.1 or more and less than 1.
  • the image forming method of the present invention is an image forming method for forming an image on a thermal transfer image receiving sheet, by stacking a thermal transfer image receiving sheet and a thermal transfer sheet having a dye layer containing a thermal transfer dye and a binder, and forming an image on the thermal transfer image receiving sheet by thermally transferring the thermal transfer dye at a print rate of 0.5 to 1.5 msec/line
  • the thermal transfer image receiving sheet is a thermal transfer image receiving sheet comprising a substrate and, on at least one surface of the substrate, a composite porous layer containing a thermoplastic resin as a main component in an amount of 50% by mass or more, and a dye receiving layer in this order from the substrate, wherein the composite porous layer comprises a porous core layer and non-porous skin layers having a porosity of 1% by volume or less layered on both surfaces of the porous core layer; a total thickness of the non-porous skin layers is 5 to 15% of a whole thickness of the composite porous layer; and a density of the
  • a thermal transfer image receiving sheet which is able to provide excellent printing sensitivity and prevent the generation of burns and folded lines even during high speed printing, and an image forming method for forming an image on the thermal transfer image receiving sheet, can be provided.
  • sheet encompasses the sheet and film defined in the definition of JIS-K6900.
  • sheet means a thin and flat product whose thickness is generally small for the length and width
  • film means a thin and flat product which is generally supplied in the form of roll and whose thickness is extremely small compared to the length and width and whose maximum thickness is limited to a desired thickness. Accordingly, among sheets, one whose thickness is extremely small can be regarded as “film”. However, the line between "sheet” and “film” is not clear and they cannot be clearly distinguished from each other. In the present invention, therefore, those having a large thickness and those having a small thickness are both defined as "sheet”.
  • the thermal transfer image receiving sheet of the present invention is a thermal transfer image receiving sheet containing a substrate and, on at least one surface of the substrate, a composite porous layer containing a thermoplastic resin as a main component in an amount of 50% by mass or more, and a dye receiving layer in this order from the substrate, wherein the composite porous layer contains a porous core layer and non-porous skin layers having a porosity of 1% by volume or less layered on both surfaces of the porous core layer; a total thickness of the non-porous skin layers is 5 to 15% of a whole thickness of the composite porous layer; and a density of the composite porous layer is 0.65 to 0.74 g/cm 3 ; characterized in that when the thickness of the non-porous skin layer on the dye receiving layer side is set to "a" ⁇ m, and the thickness of the non-porous skin layer on the substrate side is set to "b" ⁇ m, "a"/"b" is 0.1 or more and less than 1.
  • a conventional thermal transfer image receiving sheet containing a porous layer and a non-porous layer is problematic in that during high speed printing, insufficient printing sensitivity is still obtained or burns and folded lines are likely to be generated. Also, as shown by the below-described Comparative Examples, printing sensitivity is likely to contradict burns and folded lines.
  • burns There are various possible reasons for the generation of burns in the formation of images by the thermal sublimation-type transfer method. One of the possible reasons is as follows: since the smoothness of the substrate influences and deteriorates the smoothness of the thermal transfer image receiving sheet, non-uniform contact with a thermal head occurs upon printing and excess heat is partially applied. Also, the reason why folded lines are likely to be generated can be considered as due to the influence of the porous structure of the porous layer.
  • the thermal transfer image receiving sheet of the present invention contains the composite porous layer which contains the porous core layer and the non-porous skin layers having a porosity of 1% by volume or less layered on both surfaces of the porous core layer and in which the percentage of the total thickness of the non-porous skin layers on both surfaces with respect to the whole thickness of the composite porous layer, the density of the whole composite porous layer and the ratio "a"/"b" of the thickness of the non-porous skin layers, are set in the above-specified ranges. Therefore, even during high speed printing, excellent printing sensitivity can be achieved, and the generation of burns and folded lines can be inhibited.
  • the mechanism of action that the thermal transfer image receiving sheet of the present invention can achieve the above objects by having the above-specified composite porous layer is not clear. However, it is supposed as follows. The present invention focuses on the percentage of the total thickness of the non-porous skin layers on both surfaces with respect to the whole thickness of the composite porous layer, the density of the whole composite porous layer, and the ratio "a"/"b" of the thicknesses of the non-porous skin layers and the present invention sets them in the above-specified ranges.
  • a thermal transfer image receiving sheet 10 contains a substrate 1 and, on at least one surface of the substrate 1, a composite porous layer 2 and a dye receiving layer 3 in this order from the substrate, and the composite porous layer 2 contains a porous core layer 21 and non-porous skin layers 22a and 22b layered on both surfaces of the porous core layer 21.
  • a thermal transfer image receiving sheet 11 shown in Fig. 2 contains, in addition to the thermal transfer image receiving sheet 10 shown in Fig. 1 , an adhesive layer 4, and an interlayer 5 and a backside layer 6. More specifically, the thermal transfer image receiving sheet 11 shown in Fig. 2 contains the substrate 1 and, on at least one surface of the substrate 1, the adhesive layer 4, the composite porous layer 2, the interlayer 5 and the dye receiving layer 3 in this order from the substrate; moreover, on the other surface of the substrate 1, the adhesive layer 4 and the backside layer 6 are disposed in this order from the substrate.
  • the composite porous layer 2 contains the porous core layer 21 and the non-porous skin layers 22a and 22b layered on both surfaces of the porous core layer 21.
  • the substrate used in the present invention is not particularly limited, as long as it is able to support the composite porous layer, the dye receiving layer and other layers provided as needed, and it is resistant to the heat applied upon thermal transfer.
  • the substrate is not particularly limited. Examples thereof include: stretched and unstretched sheets of plastics including highly heat-resistant polyesters such as polyethylene terephthalate and polyethylene naphthalate, polypropylene, polycarbonate, cellulose acetate, polyethylene derivatives, polyamide and polymethylpentene; and sheets of high quality paper, coated paper, art paper, cast-coated paper, paperboard, etc. Also, composite sheets obtained by laminating two or more of these materials can be used.
  • plastics including highly heat-resistant polyesters such as polyethylene terephthalate and polyethylene naphthalate, polypropylene, polycarbonate, cellulose acetate, polyethylene derivatives, polyamide and polymethylpentene
  • sheets of high quality paper coated paper, art paper, cast-coated paper, paperboard, etc.
  • composite sheets obtained by laminating two or more of these materials can be used.
  • a sheet of resin-coated paper (hereinafter may be referred to as RC paper) is used as the substrate of the present invention.
  • the RC paper has such a structure that polyolefin resin layers are disposed on both the dye receiving layer side and the reverse side (the opposite side to the dye receiving layer side) of a core material made of non-coated paper.
  • the core material made of non-coated paper there may be mentioned non-coated paper that is mainly made of generally used pulp. Examples of the non-coated paper include base paper, photo paper and high quality paper.
  • Examples of the resin of the polyolefin resin layer contained in the RC paper include high density polyethylene, medium density polyethylene, low density polyethylene, polypropylene, polybutene, polyisobutene, polyisobutylene, polybutadiene, polyisoprene and ethylene copolymers such as ethylene-vinyl acetate copolymers. Of them, polypropylene, high density polyethylene, medium density polyethylene and low density polyethylene are preferably used. It is preferable to add a filler such as titanium oxide to the polyolefin resin layer on the dye receiving layer side, from the viewpoint of increasing the whiteness.
  • a filler such as titanium oxide
  • the smoothness of the dye receiving layer side is increased; therefore, the surface quality of a printed matter can be maintained.
  • the balance of the curling of the image receiving paper can be controlled.
  • the thickness of the polyolefin resin layer on the dye receiving layer side is preferably about 5 to 25 ⁇ m.
  • the thickness of the polyolefin resin layer on the reverse side is preferably about 20 to 40 ⁇ m.
  • the polyolefin resin layer can be formed by preparing, applying and drying a coating solution of the above resin, or by melt extrusion of the above resin to a paper-made core material.
  • a coating solution of the above resin or by melt extrusion of the above resin to a paper-made core material.
  • the thickness of the substrate used in the present invention can be appropriately selected depending on the material so that the strength, heat resistance and so on can be appropriate.
  • the thickness is generally about 1 ⁇ m to 300 ⁇ m, preferably about 60 ⁇ m to 200 ⁇ m.
  • the composite porous layer of the thermal transfer image receiving sheet of the present invention contains a porous core layer and non-porous skin layers layered on both surfaces of the porous core layer.
  • the porous core layer is a layer having fine pores inside thereof.
  • the non-porous skin layers are layers having substantially no fine pores inside thereof. "Having substantially no fine pores” indicates having a porosity of 1% by volume or less.
  • the composite porous layer is a layer that contains a thermoplastic resin as a main component. That is, the porous core layer and the non-porous skin layers, which constitute the composite porous layer, contain a thermoplastic resin as a main component.
  • the main component is a component which is contained in an amount of 50% by mass or more, preferably 80% by mass or more, more preferably 90% by mass or more.
  • the non-porous skin layers are composed of a thermoplastic resin.
  • thermoplastic resin contained in the material for the porous core layer and the thermoplastic resin contained in the material for the non-porous skin layers are not particularly limited.
  • examples thereof include polyolefin resins such as polypropylene and polyethylene, polyester resins such as polyethylene terephthalate, and acrylic resins. They can be used alone or in combination.
  • polyolefin resins and polyester resins are preferred, and polyolefin resins are more preferred.
  • Polypropylene is particularly preferred, from the point of view that it is easy to set the density of the composite porous layer in the range specified in the present invention.
  • thermoplastic resin contained in the porous core layer and the thermoplastic resin contained in the non-porous skin layers can be the same kind of resin or different kinds of resins. From the viewpoint of adhesion and production, the thermoplastic resins are preferably the same kind of resin.
  • the method for forming fine pores inside the porous core layer can be a conventionally known method and is not particularly limited.
  • a material for the porous core layer containing a thermoplastic resin as a main component and at least one kind of immiscible particles selected from the group consisting of organic and inorganic fine particles, is formed into a sheet, and the sheet is stretched to lead to detachment of a sea-island interface or to high deformation of the regions that form the islands of the sea-island interface, thereby generating fine pores.
  • the material for the porous core layer examples include a composition in which polypropylene is contained as a main component and polyester or acrylic resin, either of which has a higher melting point than polypropylene, is mixed therewith.
  • the polyester or acrylic resin serves as a nucleating agent to form fine pores.
  • the content of the polyester or acrylic resin is preferably 2 to 10 parts by mass, with respect to 100 parts by mass of the polypropylene. When the content is 2 parts by mass or more, fine pores can be sufficiently generated, and printing sensitivity can be further increased. When the content is 10 parts by mass or less, sufficient heat resistance can be ensured.
  • polyisoprene can be further added to the material for the porous core layer. That is, a composition containing polypropylene as a main component and acrylic resin or polyester and polyisoprene, is formed into a sheet, and the sheet is stretched to form the porous core layer, thereby producing more fine minute pores. Therefore, the printing sensitivity of the thermal transfer image receiving sheet can be further increased.
  • the non-porous skin layers can be formed by using the material for the non-porous skin layers, which is the thermoplastic resin in which an appropriate additive is contained as needed.
  • the additive include a filler for increasing the degree of whiteness, such as calcium carbonate or titanium oxide.
  • the non-porous skin layers on both sides can be made of a single layer or multi-layers which are composed of multiple layers.
  • the total thickness of the non-porous skin layers is 5 to 15% of the whole thickness of the composite porous layer, preferably 6.5 to 14.5%. This is because, when the percentage of the total thickness of the non-porous skin layers of the composite porous layer is in the range, the thermal transfer image receiving sheet of the present invention has excellent printing sensitivity and excellent smoothness; therefore, the generation of burns can be prevented.
  • each of the thicknesses of the non-porous skin layers on both surfaces can be appropriately controlled.
  • the thickness of the non-porous skin layer on the dye receiving layer side is preferably 3.0 ⁇ m or less, more preferably 1.5 ⁇ m or less, still more preferably 1.0 ⁇ m or less, with satisfying the above percentage of the total thickness.
  • the thickness of the non-porous skin layer on the dye receiving layer side is preferably 0.5 ⁇ m or more.
  • the thicknesses of the layers constituting the thermal transfer image receiving sheet can be measured by means of a common thickness measuring device.
  • this object can be achieved by increasing the thickness of the non-porous skin layer on the substrate side, and it has been found that by making the thickness of the non-porous skin layer on the dye receiving layer side relatively small, particularly excellent printing density can be obtained and the generation of burns can be inhibited.
  • the thickness of the porous core layer is not particularly limited. It is generally 15 to 60 ⁇ m, particularly preferably 27 to 45 ⁇ m.
  • the whole thickness of the composite porous layer is not particularly limited. It is generally 20 to 70 ⁇ m, particularly preferably 30 to 50 ⁇ m.
  • the density of the composite porous layer is 0.65 to 0.74 g/cm 3 . Because of this, printing sensitivity can be increased; the generation of burns can be inhibited; and the generation of folded lines can be decreased.
  • the density of the composite porous layer can be calculated by the following formula (1), from the densities and thicknesses of the porous core layer and the non-porous skin layers and the whole thickness of the composite porous layer.
  • the porous core layer is referred to as "core layer”; the non-porous skin layer on the face side (the dye receiving layer side) is referred to as “face-side skin layer”; and the non-porous skin layer on the reverse side (the opposite side to the dye receiving layer side) is referred to as "reverse-side skin layer”.
  • the thickness of the core layer ⁇ the density of the core layer ) + ( the thickness of the face-side skin layer ⁇ the density of the face-side skin layer ) + ( the thickness of the reverse-side skin layer ⁇ the density of the reverse- side skin layer the thickness of the composite porous layer ⁇ the density of the composite porous layer
  • the method for forming the composite porous layer is not particularly limited. For example, there may be mentioned a method of using sheet for the composite porous layer prepared in advance.
  • the method for producing the sheet for the composite porous layer can be a conventionally known method and is not particularly limited. For example, there may be mentioned the following methods (a) to (d):
  • the method (a) is particularly preferred, from the point of view that it is easy to control the thickness of the layers.
  • the sheet for the composite porous layer can be appropriately laminated on the substrate, via the adhesive layer.
  • the dye receiving layer functions to receive sublimation dyes transferred from the thermal transfer sheet and to maintain the thus-formed image.
  • the resin contained in the dye receiving layer include polycarbonate-based resin, polyester-based resin, polyamide-based resin, acryl-based resin, cellulose-based resin, polysulfone-based resin, polyvinyl chloride resin, polyvinyl acetate resin, vinyl chloride-vinyl acetate copolymer resin, polyvinyl acetal resin, polyvinyl butyral resin, polyurethane-based resin, polystyrene-based resin, polypropylene-based resin, polyethylene-based resin, ethylene-vinyl acetate copolymer resin, epoxy resin and vinyl chloride-acryl copolymer resin.
  • a release agent can be contained in the dye receiving layer.
  • the release agent include solid waxes such as polyethylene wax, amide wax and Teflon (trademark) powder; fluorine-based and phosphoric acid ester-based surfactants; various kinds of modified silicone oils such as silicone oil, reactive silicone oil and curable silicone oil; and various kinds of silicone resins. Of them, silicone oil is preferred.
  • silicone oil one in the form of oil can be used; however, preferred is curable-type silicone oil.
  • the curable-type silicone oil include reaction curable-type silicone oil, photocurable-type silicone oil and catalyst curable-type silicone oil. Particularly preferred are reaction curable-type silicone oil and catalyst curable-type silicone oil.
  • a cured reaction product of amino-modified silicone oil with epoxy-modified silicone oil is preferred.
  • the amino-modified silicone oil include KF-393, KF-857, KF-858, X-22-3680 and X-22-3801C (manufactured by Shin-Etsu Chemical Co., Ltd.)
  • the epoxy-modified silicone oil include KF-100T, KF-101, KF-60-164 and KF-103 (manufactured by Shin-Etsu Chemical Co., Ltd.)
  • the catalyst-curable silicone oil include KS-705, FKS-770 and X-22-1212 (manufactured by Shin-Etsu Chemical Co., Ltd.)
  • the added amount of the curable silicone oils is preferably 0.5 to 30% by mass (solid content equivalent) of the whole material for the dye receiving layer.
  • solid content indicates all components other than solvent.
  • a pigment and a filler can be added to the dye receiving layer, such as titanium oxide, zinc oxide, kaolin, clay, calcium carbonate and finely-powdered silica.
  • a plasticizer such as a phthalic acid ester compound, a sebacic acid ester compound or a phosphoric acid ester compound can be added.
  • the applied amount of a coating solution for the dye receiving layer is not particularly limited. It is preferably 0.5 to 10 g/m 2 in the dry state.
  • a release layer can be further provided to the thermal transfer image receiving sheet of the present invention, by dissolving or dispersing the above-mentioned release agent in an appropriate solvent, applying the mixture to at least a part of the surface of the dye receiving layer, and drying the same.
  • the release agent which constitutes the release layer is particularly preferably the above-mentioned cured reaction product of the amino-modified silicone oil with the epoxy-modified silicone oil.
  • the thickness of the release layer is not particularly limited. It is generally 0.01 to 5.0 ⁇ m, preferably 0.05 to 2.0 ⁇ m.
  • the release layer can be also formed by applying, when forming the dye receiving layer, the silicone oil-mixed coating solution for the dye receiving layer and then curing the silicone oil which bleeds out of the surface.
  • the adhesive layer 4 can be provided as needed, between the composite porous layer 2 and the substrate 1, between the backside layer 6 described below and the substrate 1, etc.
  • the adhesive layer can be appropriately selected depending on the method of attachment, such as dry lamination, wet lamination or adhesion by irradiation with electron beam after attachment, and it is not particularly limited.
  • the adhesive material which constitutes the adhesive layer for example, there may be mentioned those containing, as the constituent, vinyl acetate resin, acrylic resin, vinyl acetate-acryl copolymer resin, vinyl acetate-vinyl chloride copolymer resin, ethylene-vinyl acetate copolymer resin, polyamide resin, polyvinyl acetal resin, polyester resin, polyurethane resin, etc.
  • the interlayer 5 can be provided between the composite porous layer 2 and the dye receiving layer 3.
  • the purpose of the interlayer is to impart adhesion between the composite porous layer and the dye receiving layer, whiteness, cushioning properties, concealing properties, antistatic properties, curl prevention properties, etc.
  • any conventionally-known interlayer can be provided.
  • a filler such as titanium oxide, zinc oxide, magnesium carbonate or calcium carbonate can be added to the interlayer.
  • a stilbene-based compound, a benzimidazole-based compound, a benzoxazole-based compound, etc. can be added to the interlayer, as a fluorescent whitener.
  • a hindered amine-based compound, a hindered phenol-based compound, a benzotriazole-based compound, a benzophenone-based compound, etc. can be added to the interlayer, as a UV absorber or antioxidant.
  • cation-based acrylic resin, polyaniline resin, various kinds of electroconductive fillers, etc. can be added to the interlayer.
  • the applied amount of the interlayer is not particularly limited. It is preferably about 0.5 to 5 g/m 2 in the dry state.
  • the backside layer 6 can be disposed on the reverse side of the substrate 1 (the opposite side to the side on which the dye receiving layer 3 is disposed).
  • the backside layer any one with desired functions can be appropriately selected, depending on the intended use and so on of the thermal transfer image receiving sheet of the present invention.
  • the backside layer it is particularly preferable to use a backside layer with a function of increasing the property of conveying the thermal transfer image receiving sheet and a function of preventing curling.
  • the material which constitutes the backside layer with the function of increasing the conveying property and the curling prevention function is not particularly limited, as long as it is a material that is able to impart a desired conveying property and a desired curling prevention property.
  • a material in which a filler as an additive is added in a binder resin which is composed of acryl-based resin, cellulose-based resin, polycarbonate resin, polyvinyl acetal resin, polyvinyl alcohol resin, polyamide resin, polystyrene-based resin, polyester-based resin, halogenated polymer or the like, is used.
  • the method for producing the thermal transfer image receiving sheet of the present invention is not particularly limited, as long as it is a method that is able to obtain the above-described thermal transfer image receiving sheet of the present invention.
  • the thermal transfer image receiving sheet of the present invention can be produced by laminating the above-mentioned layers by a known method.
  • the coating solution for the dye receiving layer and other coating solutions for forming layers that are disposed as needed are applied in sequence onto the sheet for the composite porous layer obtained by the above-mentioned method, followed by drying, thereby producing the dye receiving layer and other layers; thereafter, the substrate is attached to one surface of the sheet for the composite porous layer, which is a surface on the opposite side to the dye receiving layer side of the sheet, via the adhesive layer.
  • the thermal transfer image receiving sheet of the present invention can be produced in such a manner that the sheet for the composite porous layer obtained by the above-mentioned method is attached onto the substrate via the adhesive layer, and then the coating solution for the dye receiving layer and other coating solutions for forming layers that are disposed as needed are applied in sequence and dried, thereby producing the thermal transfer image receiving sheet of the present invention.
  • the coating solutions for forming other layers coating solutions in which materials are dissolved or dispersed in solvents as needed, can be used.
  • the method for applying the coating solutions is not particularly limited and can be applied by a known method such as gravure coating.
  • the layers which constitute the thermal transfer image receiving sheet of the present invention can be formed by forming the materials for forming the layers into sheets and then laminating the sheets via the adhesive layers.
  • the image forming method of the present invention is an image forming method for forming an image on a thermal transfer image receiving sheet, by stacking a thermal transfer image receiving sheet and a thermal transfer sheet having a dye layer containing a thermal transfer dye and a binder, and forming an image on the thermal transfer image receiving sheet by thermally transferring the thermal transfer dye at a print rate of 0.5 to 1.5 msec/line, wherein the above-described thermal transfer image receiving sheet of the present invention is used as the thermal transfer image receiving sheet.
  • thermo transfer image receiving sheet of the present invention by virtue of the use of the above-mentioned thermal transfer image receiving sheet of the present invention, a high-density printed matter can be realized even during high speed printing at a print rate of 0.5 to 1.5 msec/line, and the generation of burns and the generation of folded lines on the thermal transfer image receiving sheet can be prevented.
  • the resolution can be set to 300 dpi, for example.
  • the image forming method of the present invention is not particularly limited, except that the above-mentioned thermal transfer image receiving sheet of the present invention is used as a transfer receiving member.
  • the thermal transfer recording device and the thermal transfer sheet a known device and sheet can be used.
  • the thermal transfer sheet for example, there may be used one having the following layer structure: a dye layer containing a thermal transfer dye (sublimation dye) and a binder is disposed on one surface of a substrate sheet, and a heat resistant slipping layer containing a heat resistant resin is disposed on the other surface of the substrate sheet.
  • a thermal transfer sheet disclosed in Japanese Patent Application Laid-Open No. 2012-158121 can be used.
  • the sheet for the composite porous layer, which constitutes the composite porous layer, was prepared by the following process.
  • a resin composition (a) and a resin composition (b) were used.
  • the resin composition (b) was obtained by mixing 100 parts by mass of polypropylene having a melt index of 3.0 g/10 min and 0.1 part by mass of cross-linked copolymer particles having a droplet retention time of 10 minutes or more, which were obtained by subjecting the cross-linked acryl-styrene-based copolymer particles of the resin composition (a) to a surface treatment with a polymer-type silane coupling agent.
  • the resulting laminate was cooled by a cooling roller at 60°C, thereby obtaining an unstretched sheet.
  • the unstretched sheet was stretched at a stretching temperature of 135°C, in a vertical direction by a factor of 4.5.
  • the sheet was stretched with a tenter-type stretching machine at 165°C, in a lateral direction by a factor of 8.
  • the sheet was heated at 170°C to be formed into a biaxial stretched sheet having a thickness of 45 ⁇ m.
  • One surface of the sheet was subjected to a corona treatment, thereby obtaining the sheet for the composite porous layer.
  • the coating solution for the interlayer which is a coating solution of the following composition
  • the coating solution for the dye receiving layer which is a coating solution of the following composition
  • the coating solution for the dye receiving layer was applied thereon by a gravure coater so as to be 4 g/m 2 after drying, and the applied coating solution was dried at 110°C for one minute, thereby forming the interlayer and the dye receiving layer.
  • the coating solution for the adhesive layer which is a coating solution of the following composition, was applied by a three reverse roller coating method and dried to form the adhesive layer.
  • An RC paper manufactured by Mitsubishi Paper Mills Limited., thickness 190 ⁇ m was attached onto the adhesive layer by dry lamination, thereby producing the thermal transfer image receiving sheet of Example 1.
  • the thickness of the non-porous skin layer on the face side (the dye receiving layer side), the thickness of the porous core layer, and the thickness of the non-porous skin layer on the reverse side (the opposite side to the dye receiving layer side), all of which constitute the composite porous layer, are 2.4 ⁇ m, 42.0 ⁇ m and 0.6 ⁇ m, respectively.
  • the non-porous skin layer on the face side, the porous core layer and the non-porous skin layer on the reverse side are simply referred to as "face-side skin layer”, “core layer” and “reverse-side skin layer”, respectively.
  • the percentage of the total thickness of the non-porous skin layers is 6.7% of the whole thickness of the composite porous layer.
  • the densities of the non-porous skin layers on the face side and the reverse side are both 0.92 g/cm 3 .
  • the density of the porous core layer is 0.706 g/cm 3 .
  • the density of the whole composite porous layer calculated by the following formula (1), from the densities and thicknesses of the layers, is 0.72 g/cm 3 .
  • the thermal transfer image receiving sheet of Comparative Example 2 was obtained in the same manner as Comparative Example 1, except that the sheet for the composite porous layer was formed so that the density of the whole composite porous layer becomes 0.67 g/cm 3 .
  • the thermal transfer image receiving sheet of Example 3 was obtained in the same manner as Comparative Example 1, except that the sheet for the composite porous layer was formed so that the thicknesses of the face-side skin layer and the reverse-side skin layer become the values shown in Table 1.
  • the thermal transfer image receiving sheet of Comparative Example 4 was obtained in the same manner as Comparative Example 1, except that the sheet for the composite porous layer was formed so that the thicknesses of the layers become the values shown in Table 1 and the density of the whole composite porous layer becomes 0.70 g/cm 3 .
  • the thermal transfer image receiving sheet of Example 5 was obtained in the same manner as Comparative Example 1, except that the sheet for the composite porous layer was formed so that the thicknesses of the layers become the values shown in Table 1 and the density of the whole composite porous layer becomes 0.70 g/cm 3 .
  • the thermal transfer image receiving sheet of Comparative Example 6 was obtained in the same manner as Comparative Example 1, except that the sheet for the composite porous layer was formed so that the thicknesses of the layers become the values shown in Table 1 and the density of the whole composite porous layer becomes 0.70 g/cm 3 .
  • the thermal transfer image receiving sheet of Comparative Example 7 was obtained in the same manner as Comparative Example 1, except that the sheet for the composite porous layer was formed so that the thicknesses of the layers become the values shown in Table 1.
  • the thermal transfer image receiving sheet of Comparative Example 8 was obtained in the same manner as Comparative Example 1, except that the sheet for the composite porous layer was formed so that the density of the whole composite porous layer becomes 0.75 g/cm 3 .
  • the thermal transfer image receiving sheet of Comparative Example 9 was obtained in the same manner as Comparative Example 1, except that the sheet for the composite porous layer was formed so that the thicknesses of the layers become the values shown in Table 1 and the density of the whole composite porous layer becomes 0.63 g/cm 3 .
  • the thermal transfer image receiving sheet of Comparative Example 10 was obtained in the same manner as Comparative Example 1, except that the sheet for the composite porous layer was formed so that the thicknesses of the layers become the values shown in Table 1 and the density of the whole composite porous layer becomes 0.69 g/cm 3 .
  • the thermal transfer image receiving sheet of Comparative Example 11 was obtained in the same manner as Comparative Example 1, except that the sheet for the composite porous layer was formed so that the thicknesses of the layers become the values shown in Table 1 and the density of the whole composite porous layer becomes 0.61 g/cm 3 .
  • the thermal transfer image receiving sheet of Comparative Example 12 was obtained in the same manner as Comparative Example 1, except that the sheet for the composite porous layer was formed so that the thicknesses of the layers become the values shown in Table 1 and the density of the whole composite porous layer becomes 0.57 g/cm 3 .
  • the thermal transfer image receiving sheet of Comparative Example 13 was obtained in the same manner as Comparative Example 1, except that the sheet for the composite porous layer was formed so that the thicknesses of the layers become the values shown in Table 1.
  • the thermal transfer image receiving sheet of Comparative Example 14 was obtained in the same manner as Comparative Example 1, except that the sheet for the composite porous layer was formed so that the thicknesses of the layers become the values shown in Table 1 and the density of the whole composite porous layer becomes 0.68 g/cm 3 .
  • the thermal transfer image receiving sheet of Comparative Example 15 was obtained in the same manner as Comparative Example 1, except that the sheet for the composite porous layer was formed so that the thicknesses of the layers become the values shown in Table 1 and the density of the whole composite porous layer becomes 0.62 g/cm 3 .
  • solid black images (255/255 images) were formed by printing using the yellow, magenta and cyan dye layers in this order, in the following printing conditions. The thus-obtained solid black images were evaluated for burns.
  • a polyethylene terephthalate film having a thickness of 4.5 ⁇ m (“Lumirror” manufactured by Toray Industries, Inc.) was used as the substrate sheet.
  • the coating solution for forming the heat resistant slipping layer which is a coating solution of the following composition, was applied by gravure coating so that the thickness becomes 1.0 g/m 2 after drying, followed by drying, thereby forming the heat resistant slipping layer.
  • the coating solutions for the yellow, magenta and cyan dye layers which are the coating solutions having the following compositions, were each applied by gravure coating at an amount of 1.0 g/m 2 (solid content equivalent) and dried, thereby forming the yellow, magenta and cyan dye layers.
  • burn means that a change in hue occurs in the black area of a printed matter and, as a result, the printed matter surface is mat and not glossy.
  • Table 1 The evaluation results are shown in Table 1.
  • the sample sheet was moved back and forth three times in the direction of the roller axis, unbent again and then visually observed for the condition of folded lines to evaluate the ease of generation of folded lines according to the following evaluation criteria.
  • the evaluation results are shown in Table 1.
  • the percentage of the total thickness of the non-porous skin layers is in a range of 5 to 15% of the whole thickness of the composite porous layer, and the density of the composite porous layer is 0.65 to 0.74 g/cm 3 . Therefore, the generation of burns was prevented; excellent printing sensitivity was obtained; and folded lines were not generated.
  • the density of the composite porous layer is larger than the density specified in the present invention. Therefore, although folded lines were not generated, poor printing sensitivity was obtained, and burns were generated.
  • the total thickness of the non-porous skin layers is larger than the thickness specified in the present invention, and the density of the composite porous layer is smaller than the density specified in the present invention. Therefore, although burns were not generated, poor printing sensitivity was obtained, and folded lines were generated.
  • the total thickness of the non-porous skin layers is larger than the thickness specified in the present invention. Therefore, although burns and folded lines were not generated, poor printing sensitivity was obtained.
  • the total thickness of the non-porous skin layers is larger than the thickness specified in the present invention, and the density of the composite porous layer is smaller than the density specified in the present invention. Therefore, although burns were not generated, folded lines were generated. The reason for the excellent printing sensitivity is presumed to be due to the small density of the composite porous layer, although the total thickness of the non-porous skin layers is large.
  • the density of the composite porous layer is smaller than the density specified in the present invention. Therefore, although burns were not generated and excellent printing sensitivity was obtained, folded lines were generated.
  • the total thickness of the non-porous skin layers is smaller than the thickness specified in the present invention. Therefore, although excellent printing sensitivity was obtained and folded lines were not generated, burns were generated.
  • the total thickness of the non-porous skin layers is larger than the thickness specified in the present invention, and the density of the composite porous layer is smaller than the thickness specified in the present invention. Therefore, poor printing sensitivity was obtained, and burns and folded lines were generated.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)

Claims (6)

  1. Wärmeübertragungsbild-erhaltendes Blatt umfassend ein Substrat und auf mindestens einer Oberfläche des Substrats eine poröse Verbundschicht enthaltend ein thermoplastisches Harz als Hauptbestandteil in einer Menge von 50 Massen-% oder mehr, und ein Farbstoff-erhaltende Schicht in dieser Reihenfolge von dem Substrat,
    wobei die poröse Verbundschicht ein gestrecktes Blatt ist, umfassend eine poröse Kernschicht und nicht-poröse Hautschichten mit einer Porosität 1 Volumen-% oder weniger geschichtet auf beiden Oberflächen der porösen Kernschicht; eine Gesamtstärke der nicht-porösen Hautschichten 5 bis 15 % einer Gesamtstärke der porösen Verbundschicht ist; und die Dichte der porösen Verbundschicht 0,65 bis 0,74 g/cm3 ist;
    dadurch gekennzeichnet, dass, wenn die Stärke der nicht-porösen Hautschicht auf der Farbstoff-erhaltenden Schichtseite auf "a"µm eingestellt ist, und die Stärke der nicht-porösen Hautschicht auf der Substratseite auf "b"µm eingestellt ist, "a"/"b" 0,1 oder mehr und weniger als 1 ist.
  2. Wärmeübertragungsbild-erhaltendes Blatt nach Anspruch 1,
    wobei die poröse Verbundschicht eine poröse Kernschicht und nicht-poröse Hautschichten umfasst, die auf beiden Oberflächen der porösen Kernschicht geschichtet sind; die poröse Kernschicht und die nicht-porösen Hautschichten gestreckt werden, nachdem sie laminiert wurden.
  3. Wärmeübertragungsbild-erhaltendes Blatt nach Anspruch 1 oder 2, wobei die poröse Kernschicht und die nicht-porösen Hautschichten Polypropylen enthalten.
  4. Bildgebungsverfahren zum Bilden eines Bilds auf einem Wärmeübertragungsbild-erhaltenden Blatt durch Stapeln eines Wärmeübertragungsbild-erhaltenden Blatts und eines Wärmeübertragungsblatts, das eine Farbstoffschicht hat, die einen Wärmeübertragungsfarbstoff und ein Bindemittel enthält, und Bilden eines Bilds auf dem Wärmeübertragungsbild-erhaltenden Blatt durch thermisches Übertragen des Wärmeübertragungsfarbstoffs mit einer Druckrate von 0,5 bis 1,5 ms/Zeile,
    wobei das Wärmeübertragungsbild-erhaltende Blatt ein Wärmeübertragungsbild-erhaltendes Blatt ist, umfassend ein Substrat und auf mindestens einer Oberfläche des Substrats eine poröse Verbundschicht enthaltend ein thermoplastisches Harz als Hauptbestandteil in einer Menge von 50 Massen-% oder mehr, und ein Farbstoff-erhaltende Schicht in dieser Reihenfolge von dem Substrat; die poröse Verbundschicht ein gestrecktes Blatt ist, umfassend eine poröse Kernschicht und nicht-poröse Hautschichten mit einer Porosität 1 Volumen-% oder weniger geschichtet auf beiden Oberflächen der porösen Kernschicht; eine Gesamtstärke der nicht-porösen Hautschichten 5 bis 15 % einer Gesamtstärke der porösen Verbundschicht ist; und die Dichte der porösen Verbundschicht 0,65 bis 0,74 g/cm3 ist;
    dadurch gekennzeichnet, dass, wenn die Stärke der nicht-porösen Hautschicht auf der Farbstoff-erhaltenden Schichtseite auf "a"µm eingestellt ist, und die Stärke der nicht-porösen Hautschicht auf der Substratseite auf "b"µm eingestellt ist, "a"/"b" 0,1 oder mehr und weniger als 1 ist.
  5. Bildgebungsverfahren nach Anspruch 4,
    wobei die poröse Verbundschicht eine poröse Kernschicht und nicht-poröse Hautschichten umfasst, die auf beiden Oberflächen der porösen Kernschicht geschichtet sind; die poröse Kernschicht und die nicht-porösen Hautschichten gestreckt werden, nachdem sie laminiert wurden.
  6. Bildgebungsverfahren nach Anspruch 4 oder 5, wobei die poröse Kernschicht und die nicht-porösen Hautschichten Polypropylen enthalten.
EP14754013.2A 2013-02-19 2014-01-27 Wärmetransferbildempfangsfolie und bilderzeugungsverfahren Active EP2942202B1 (de)

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ES2791719T3 (es) * 2014-12-05 2020-11-05 Schoeller Technocell Gmbh & Co Kg Material de registro para procedimientos de impresión térmica
WO2021100850A1 (ja) * 2019-11-20 2021-05-27 大日本印刷株式会社 熱転写受像シート、印画物の製造方法及び印画物
US20230082532A1 (en) * 2020-02-25 2023-03-16 Dai Nippon Printing Co., Ltd. Thermal transfer sheet and method for producing printed material

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JP3026703B2 (ja) * 1993-06-23 2000-03-27 王子油化合成紙株式会社 熱転写画像受容シート用支持体
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WO2014129269A1 (ja) 2014-08-28
US9290007B2 (en) 2016-03-22
US20150367651A1 (en) 2015-12-24

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